Subscribers after migrating to CMS5 R2

I have migrated a site from 4.62 to CMS 5 R2 and almost everything works fine!

The customer has a weekly newsletter which has over 300 subscibers. They wanted to convert the newsletter to a Blogg type. I convert the newsletter pagetype to a grupp blogg. It went well, but when I now try to add a blogg page, I get an exception:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

No problem. I have an another blogg that is working. I just want to move every subscribers to that blogg. How to do that???

I tried to find the subscribers at the database. I subscribed myself some pages and found myself in the dbo.aspnet_Profile table. But I'm the only subscriber there... Where are the others? Did the migration tool miss them?

So... can't I convert a "normal page" to a "group blogg start" AND where are the subscribers and how to move them?

Yes, the subscriptions are there in the tblUserProperty. By linking the tblUserProperty with tblUser using fkSID i can print out every over 400 subscribers and their subscriptions.

When I look at one subscriber who has 2 newsletter subscribed at EPiServer 4 database, I find him also in EPiServer CMS5 database, at the dbo.aspnet_Profile table in the PropertyValuesString field with the following text: